footpad question

hi i no that there is a forum on footpads but just wondering what u guys think. they are supposed to draw toxins out of your body including central nervous system. all the sites that i have seen selling them do have evidence from hair testing and footpad testing that they do work. I have also talked to a person whos friend used them with hight ammounts of something (cant remember but it was definalty a heay metal) and she had a very high reading done on hair testing after three months of footpads and another hair test it was all gone. any thoughts.